وَإِذَا أَذَّنَ الْمُؤَذِّنُ يَوْمَ الْجُمُعَةِ الْأَذَانَ الْأَوَّلَ: تَرَكَ النَّاسُ الْبَيْعَ وَالشِّرَاءَ، وَتَوَجَّهُوا إِلَى الْجُمُعَةِ.
Translation: When the first Friday adhan is called, people leave buying and selling and proceed to Jumuah.
This rule concerns the call at which those obligated to attend are required to depart and leave commerce. Jurists discuss how the historic minbar call and the earlier public announcement correspond in practical settings.